I've tried repeatedly with my Audiovox SMT 5600, and it doen't work. It has been possible to start some of the pairing process, enter 0000 on each, and I've gotten it as far as diplaying my device name on the car and vice versa, but it drops the BT connection shortly after that point.

Haven't even gotten close to being able to make a call.

I did confirm that it works absolutely fine with my wife's Moto Rokr. Glad for her but depressed for me.